Fix heating energy calculation and reporting errors for gas fired and exhaust fired absorption chillerheater models

[jcyuan2020]

Pull request overview

• Fixes Heating report value NaN problem due to exhaust fired absorption chillerheater model floating point errors #8644
• Fix the exhaust fired absorption chillerheater model heating energy calculation and reporting errors, which caused NaN values in tabular reports.
• Similar problems could be encountered for the gas fired absorption chillerheater as well. The PR also included the fix for the the gas fired absorption chillerheat model.

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[mjwitte]

Tested the defect file before and after:
develop debug build crashes.
develop release build has NANs in BEPS.
this branch debug build completes without NANs.

[mjwitte]

Straightforward change to protect against divide by zero here and in the next chiller.
Minor formatting issue here, but that will get cleaned up with a global clang format sweep, so not holding this up for that.

[mjwitte]

Not waiting any longer for CI to finish, merging.